Still confused by the nonprofit switch by Microsoft

I am so sorry if this is duplicated, but everywhere I turn, the information is different. 

Currently, we have the following and number of licenses for each:

(3) Business Premium expire 10/1/2025

(4) Power Automate with an expiration of n/a

(4) Nonprofit portal expire 4/20/2033

(5) 365 E1 with expire of 4/24/26

As for Power Automate and Nonprofit Portal, I think there is no change to those (although I have no idea what they are). 

Tech Soup is saying that https://cloud.techsoup.org/product/?id=325C813E-15C3-4995-837F-B18F00828ED1 is $1 per month per license, but I read in other venues that there are 10 donated. 

Microsoft hosts our email. We have 3 email addresses are used for both email and One Drive. We have another 2 that are desktop locations that really do not use email but use One Drive and we have 1 that we only use as an email for a specific project. This means we have 6 email addresses, as some are in 1 license group and not the other. I am so confused. 

I don't understand why we have both Business Premium and 365 E1. And why there are some email addresses are in both but not all. 

Because 365 E1 does not expire until 4/24/26, does that mean I do not have to do anything until next April for those email addresses that are listed in this category. But would need to change for the email addresses in Business Premium, even though some are in both?

I do understand the web-version vs desktop options.